<!DOCTYPE html>
<html lang="zh">
    <head>
        <meta charset="UTF-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <title>Document</title>
    </head>
    <body>
        <script>
            /* 
                - Navigator —— 浏览器的对象（可以用来识别浏览器）
                    userAgent 返回一个用来描述浏览器信息的字符串
                       
            */

            // console.log(navigator.userAgent)

            let sBrowser
            const sUsrAg = navigator.userAgent

            // The order matters here, and this may report false positives for unlisted browsers.

            if (sUsrAg.indexOf("Firefox") > -1) {
                sBrowser = "Mozilla Firefox"
                // "Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:61.0) Gecko/20100101 Firefox/61.0"
            } else if (sUsrAg.indexOf("SamsungBrowser") > -1) {
                sBrowser = "Samsung Internet"
                // "Mozilla/5.0 (Linux; Android 9; SAMSUNG SM-G955F Build/PPR1.180610.011) AppleWebKit/537.36 (KHTML, like Gecko) SamsungBrowser/9.4 Chrome/67.0.3396.87 Mobile Safari/537.36
            } else if (
                sUsrAg.indexOf("Opera") > -1 ||
                sUsrAg.indexOf("OPR") > -1
            ) {
                sBrowser = "Opera"
                // "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36 OPR/57.0.3098.106"
            } else if (sUsrAg.indexOf("Trident") > -1) {
                sBrowser = "Microsoft Internet Explorer"
                // "Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; .NET4.0C; .NET4.0E; Zoom 3.6.0; wbx 1.0.0; rv:11.0) like Gecko"
            } else if (sUsrAg.indexOf("Edge") > -1) {
                sBrowser = "Microsoft Edge (Legacy)"
                // "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36 Edge/16.16299"
            } else if (sUsrAg.indexOf("Edg") > -1) {
                sBrowser = "Microsoft Edge (Chromium)"
                // Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36 Edg/91.0.864.64
            } else if (sUsrAg.indexOf("Chrome") > -1) {
                sBrowser = "Google Chrome or Chromium"
                // "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/66.0.3359.181 Chrome/66.0.3359.181 Safari/537.36"
            } else if (sUsrAg.indexOf("Safari") > -1) {
                sBrowser = "Apple Safari"
                // "Mozilla/5.0 (iPhone; CPU iPhone OS 11_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/11.0 Mobile/15E148 Safari/604.1 980x1306"
            } else {
                sBrowser = "unknown"
            }

            alert(`You are using: ${sBrowser}`)
        </script>
    </body>
</html>
